TW202004553A - Fingerprint enrollment method and electronic device for the same - Google Patents
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本發明是關於生物特徵的註冊,特別是關於指紋的註冊方法。The invention relates to the registration of biometrics, especially to the registration method of fingerprints.
指紋辨識為現今常用於電子裝置上,作為使用者身份辨識的技術,使用者必須預先將至少一手指頭的指紋註冊於電子裝置中。當需要進行身份辨識時(例如解鎖電子裝置、開啟特定應用程式、使用特定功能等),電子裝置感測使用者的指紋並與預先註冊的指紋加以比對,以辨識使用者身份。Fingerprint recognition is commonly used in electronic devices today. As a user identification technology, a user must register at least one finger's fingerprint in the electronic device in advance. When identity recognition is required (such as unlocking an electronic device, opening a specific application, using a specific function, etc.), the electronic device senses the user's fingerprint and compares it with the pre-registered fingerprint to identify the user's identity.
一般來說,指紋感測器的尺寸比手指小。一種現有技術中的指紋註冊方法,需要使用者以手指的不同部位多次按壓指紋感測器。請參閱圖13,在多次按壓的過程中,指紋感測器獲得手指的多張指紋圖像60作為指紋註冊資訊。這種方法存在著缺點。使用者實際上並不能確認他是否已經將手指的每個部位都按壓過指紋感測器,因此指紋感測器獲得的多張指紋圖像60通常仍不夠完整,需要使用者增加按壓的次數。這種方式對於使用者而言並不方便,而且會增加註冊的時間。Generally, the size of the fingerprint sensor is smaller than the finger. A fingerprint registration method in the prior art requires the user to press the fingerprint sensor multiple times with different parts of the finger. Please refer to FIG. 13. During multiple presses, the fingerprint sensor obtains
另一種現有技術中的指紋註冊方法,係為掃滑註冊方法。如圖14所示,使用者須將手指頭在指紋感測器上以不同方向滑動多次,讓指紋感測器獲得手指頭不同部位的指紋圖像70,以作為指紋註冊資訊。這種方式存在著缺點。如圖15所示,圖15的箭頭代表手指在指紋感測器上滑動的方向。手指在指紋感測器上滑動到離開該指紋感測器的過程中,手指接觸的力道會改變,並且手指的移動速度通常會愈來愈快,使得指紋感測器容易擷取到變形的指紋圖像,例如指紋圖像71、72所示。Another fingerprint registration method in the prior art is a swipe registration method. As shown in FIG. 14, the user must slide the finger on the fingerprint sensor multiple times in different directions to allow the fingerprint sensor to obtain
有鑑於此,本發明提出一種指紋註冊方法,以期解決現有技術中註冊時間過長、所獲得的指紋圖像不夠完整,以及容易擷取到變形的指紋圖像等缺點。In view of this, the present invention proposes a fingerprint registration method, with a view to solving the shortcomings in the prior art that the registration time is too long, the obtained fingerprint image is not complete, and the deformed fingerprint image is easily captured.
為達到上述之發明目的,本發明所採用的技術手段為提供一種指紋註冊方法,該方法包括: (a)提供一指示,該指示係用以提示使用者將手指以螺旋路徑在一指紋感測器上移動;以及 (b)在該手指在該指紋感測器上移動時,該指紋感測器感測該手指以獲得多張指紋圖像。In order to achieve the above-mentioned object of the invention, the technical means adopted by the present invention is to provide a fingerprint registration method. The method includes: (a) providing an instruction to prompt the user to use a spiral path to sense a fingerprint on the fingerprint Move on the device; and (b) when the finger moves on the fingerprint sensor, the fingerprint sensor senses the finger to obtain multiple fingerprint images.
另一方面,本發明提供一種電子裝置,其中包括: 一指紋感測器;以及 一顯示器,在該電子裝置進行指紋註冊時,該顯示器顯示一指示; 其中,該指示係用以提示一使用者將手指以螺旋路徑在該指紋感測器上移動,使得該指紋感測器獲得多張指紋圖像。On the other hand, the present invention provides an electronic device, including: a fingerprint sensor; and a display, which displays an indication when the electronic device performs fingerprint registration; wherein, the indication is used to prompt a user Move the finger on the fingerprint sensor in a spiral path, so that the fingerprint sensor obtains multiple fingerprint images.
本發明的優點在於透過指示提醒使用者以螺旋路徑來進行指紋註冊。手指頭以螺旋狀進行移動,可以讓指紋感測器在短時間內收集到多張的指紋圖像,不僅可有效縮短註冊時間,而且較不容易獲得變形的指紋圖像。The advantage of the present invention is to remind the user to use a spiral path for fingerprint registration through instructions. The finger moves in a spiral shape, which allows the fingerprint sensor to collect multiple fingerprint images in a short time, which not only can effectively shorten the registration time, but also make it easier to obtain deformed fingerprint images.
請參閱圖12,根據本發明的一實施例,一電子裝置包括一指紋感測器20、顯示器40、一處理單元21以及一儲存媒體22,處理單元21耦接指紋感測器20、顯示器40及儲存媒體22。指紋感測器20用以感測一手指的指紋。指紋感測器20的尺寸小於該手指。舉例而言,目前指紋感測器的尺寸為6mm*6mm至12mm*12mm,而手指大小約為20mm*20mm左右。指紋感測器20可以是光學式,或者是電容式,都可以適用於本發明。Referring to FIG. 12, according to an embodiment of the present invention, an electronic device includes a
請參閱圖1A所示,本發明之指紋註冊方法包含以下步驟:Please refer to FIG. 1A, the fingerprint registration method of the present invention includes the following steps:
提供註冊路徑指示(S10):處理單元21提供一指示,該指示係用來提示使用者將手指以螺旋路徑在一指紋感測器上移動。在一實施例中,該指示為一視覺可見的指示。在該電子裝置進行指紋註冊的操作時,該處理單元21提供該指示給顯示器40,並且使顯示器40顯示該指示,顯示的方式可有以下多種不同實施態樣,但不以此為限。在其他的實施例中,該指示亦可以是一聲音指示Provide registration path instruction (S10): The
獲得指紋圖像(S20):請配合參閱圖2及圖3,當手指10在該指紋感測器20上時,該指紋感測器20感測手指10,以獲得一指紋圖像30。由於指紋感測器20的尺寸小於手指10,指紋圖像30係該手指10之完整指紋的一部分的圖像。在手指10在該指紋感測器20上移動的過程中,指紋感測器20對於手指10進行多次的感測,獲得多張指紋圖像30。Obtaining fingerprint image (S20): Please refer to FIG. 2 and FIG. 3, when the
指紋感測器20將獲得的多張指紋圖像30傳送給處理單元21,處理單元21根據該多張指紋圖像30產生一或多筆指紋註冊資訊。The
在一實施例中,本發明的方法更包括圖1B所示的多個步驟S30至S50。相應於步驟S30、S40以及S50的程式碼係儲存於儲存媒體22。處理單元21藉由執行儲存媒體22中的程式碼,實現步驟S30、S40與S50。In an embodiment, the method of the present invention further includes a plurality of steps S30 to S50 shown in FIG. 1B. The code corresponding to steps S30, S40, and S50 is stored in the
步驟S30是用於判斷步驟S20所獲得的指紋圖像30是否合格,當指紋圖像30被判斷為合格時,則進行步驟S40,依據合格的指紋圖像30產生一指紋註冊資訊。當指紋圖像30被判斷為不合格時,則進行步驟S50,將不合格的指紋圖像30拋棄。Step S30 is used to determine whether the
在指紋註冊的過程中,會重覆進行多次的步驟S20~S50,以獲得多張合格的指紋圖像30。在一實施例中,處理單元21更累計合格的指紋圖像30的數量,當累計合格的指紋圖像30的數量達到一預設值(例如20)時,處理單元21便通知該指紋感測器20停止感測該手指10。During the fingerprint registration process, steps S20-S50 are repeated multiple times to obtain multiple
處理單元21根據多張合格的指紋圖像30產生多筆的指紋註冊資訊,並且將該多筆的指紋註冊資訊儲存起來。當後續使用者需要進行身份辨識時,該多筆指紋註冊資訊被用來進行指紋比對以識別使用者的身份。關於根據指紋圖像產生註冊資訊的演算法及相關細節,為熟習指紋辨識領域者所熟知,在此不再詳述。The
在另一實施例中,處理單元21將該多張合格的指紋圖像30拼接為如圖11所示的一完整指紋圖像31,並根據該完整指紋圖像31產生一註冊資訊。關於將多張指紋圖像拼接成一完整的指紋圖像的技術內容係為熟習指紋辨識領域之人士所熟知,在此不在詳述。In another embodiment, the
在圖1B所示的實施例中,步驟S30包括步驟S32與S34。步驟S32是在判斷該指紋圖像30與其前一張該指紋圖像30之間是否具有差異。步驟S32的一個實施例包括將一指紋圖像30與其前一張指紋圖像30進行相減的運算。舉例來說,指紋圖像的大小為80*80個像素。判斷第N張與其前一張(即第N-1張)的指紋圖像是否有差異的方法,是先將兩張指紋圖像都轉成灰階分佈,其中每個像素的像素值以例如0~256的數值來表示。接下來將這兩張指紋圖像之各像素值相減可獲得6400(80*80)個差值,並且計算這6400個差值的總和。差值的總和被用來與一總和門檻值作比較,當差值的總和大於總和門權值時,則判斷為前後兩張指紋圖像具有差異。在其他實施例中,亦可以將上述差值的總和除以6400,獲得一差值平均,並且將該差值平均與一平均門檻值相比較。當該差值平均大於平均門檻值時則判斷為前後兩張指紋圖像具有差異。In the embodiment shown in FIG. 1B, step S30 includes steps S32 and S34. Step S32 is to determine whether there is a difference between the
如果步驟S32的判斷結果為是,則繼續進行步驟S34。如果步驟S32的判斷結果為否,則進行步驟S50拋棄指紋圖像30。在為手指10進行指紋註冊的過程中,會希望儘可能獲得手指10所有區域的指紋,藉由步驟S32,可以避免儲存多張相同的指紋圖像。如果一指紋圖像30與其前一張指紋圖像30之間具有差異,即表示這兩張的指紋圖像30是對應手指10的不同區域。If the judgment result of step S32 is yes, then proceed to step S34. If the judgment result in step S32 is NO, then step S50 is performed to discard the
步驟S34是在判斷該指紋圖像30的指紋密度D是否落在一容許範圍。指紋圖像30的指紋密度D可以有多種計算方式,在一些實施例中,是以指紋圖像30的兩條對角線(或更多的直線)所涵蓋的紋峰(ridge)數目,紋谷(valley)數目,或者紋峰與紋谷交替的次數作為指紋密度。指紋密度D的容許範圍則可以由指紋感測器20在感測該手指10所獲得的第1張指紋圖像30的指紋密度D1來決定。舉例來說,指紋密度D1為10,則該容許範圍為10的一預設範圍(例如上下30%)之間,也就是7~13。一般來說,手指在指紋感測器20的快速移動容易產出變形的指紋圖像,不能用來產生指紋註冊資訊。由於這種變形的指紋圖像的指紋密度較低,因此藉由判斷指紋圖像30的密度是否落在一容許範圍,可以排除變形的指紋圖像。Step S34 is to determine whether the fingerprint density D of the
當步驟S34判斷為是時,即表示該指紋圖像30為合格。接下來便進行步驟S40。When it is judged as YES in step S34, it means that the
根據圖1B所示的步驟S30,判斷一指紋圖像30為合格的步驟包括判斷一指紋圖像30與其前一張指紋圖像之間具有差異,以及判斷該指紋圖像的指紋密度落在一容許範圍時。惟圖1B的步驟S30僅係一實施例,並無意限制本發明。在其他的實施例中,步驟32與S34的順序可以對調。或者,步驟S30可以加入更多的判斷條件。或者,步驟S30也可以減少判斷條件,例如,步驟30只包括步驟S32與S34的其中之一。According to step S30 shown in FIG. 1B, the step of determining that a
根據本發明的方法,是讓手指10以螺旋路徑在指紋感測器20上移動,而不是多次的離開及接觸指紋感測器,因此指紋感測器20能在短時間內收集到多張的指紋圖像30,註冊時間可有效縮短。手指10以螺旋狀的路徑移動,手指按壓的力道通常較為一致,並且手指移動的速度不會太快,比較不會擷取到變形的指紋圖像變形,因此以本發明的方法取得的指紋圖像30較有利於後續的指紋比對。手指10以螺旋狀的路徑在指紋感測器20上移動,比較容易讓手指10的所有指紋都經過指紋感測器20,因此藉由本發明的方法,較為容易獲得完整的指紋圖像。According to the method of the present invention, the
請參閱圖4所示,在一實施例中,該指示係為一組文字50,顯示於顯示器40上。該組文字50的內容可以是例如「請於指紋感測器上以螺旋方式移動手指」。Please refer to FIG. 4. In one embodiment, the indicator is a set of
請參閱5所示,在一實施例中,該指示係為一螺旋狀曲線51,顯示於顯示器40上,以提示使用者按照螺旋狀曲線51來移動手指。在一實施例中,顯示器40上可顯示有指紋感測器示意位置500。Please refer to FIG. 5. In one embodiment, the indicator is a
在其他的實施例中,該指示包括一螺旋狀曲線以及一方向記號,該方向記號用於指示該螺旋狀曲線的方向是由內而外或由外而內,以提示該使用者移動手指的方向。例如在圖6中顯示的指示520包括一螺旋狀曲線52與一方向記號524。該方向記號524為一箭頭,位於螺旋狀曲線52的一端。方向記號524用以表示該螺旋狀曲線52之內部端點521為起點,並以該螺旋狀曲線52之外圍末端點522為終點。或者,例如在圖7中顯示的指示530包括一螺旋狀曲線53與一方向記號534。方向記號534位於螺旋狀曲線53的一端。該方向記號534為一箭頭,用以表示該螺旋狀曲線53之外圍末端點532為起點,並以該螺旋狀曲線53之中心端點531為終點。In other embodiments, the indication includes a spiral curve and a direction sign, the direction sign is used to indicate whether the direction of the spiral curve is from inside to outside or from outside to inside to remind the user to move the finger direction. For example, the
在圖6中,指示520的方向是順時針方向。在圖8顯示的實施例,指示540的方向則為逆時針方向。In FIG. 6, the direction indicated 520 is clockwise. In the embodiment shown in FIG. 8, the direction of the
在其他實施例中,該指示為一動畫。以圖5所示的螺旋狀曲線51為例,顯示器40顯示該指示的方法是由內而外顯示該螺旋狀曲線51,或由外而內顯示該螺旋狀曲線51。如圖9A至圖9C所示,在顯示該螺旋狀曲線51時,係由內而外顯示該螺旋狀曲線51,舉例而言,首先如圖9A顯示第一線段511,接著如圖9B顯示第一線段511及第二線段512,再接著如圖9C顯示第一線段511、第二線段512、及第三線段513,最後再如圖5顯示完整的螺旋狀曲線51。In other embodiments, the indication is an animation. Taking the
另一個實施例請參閱圖10A至圖10C配合圖5所示,顯示器40在顯示該螺旋狀曲線51時,係由外而內顯示該螺旋狀曲線51,舉例而言,首先如圖10A顯示第四線段514,接著如圖10B顯示第四線段514及第五線段515,再接著如圖10C顯示第四線段514、第五線段515、及第六線段516,最後再如圖5顯示完整的螺旋狀曲線51。For another embodiment, please refer to FIG. 10A to FIG. 10C in conjunction with FIG. 5, when the
以上所述僅是本發明的實施例而已,並非對本發明做任何形式上的限制,雖然本發明已以實施例揭露如上,然而並非用以限定本發明,任何所屬技術領域中具有通常知識者,在不脫離本發明技術方案的範圍內,當可利用上述揭示的技術內容作出些許更動或修飾為等同變化的等效實施例,但凡是未脫離本發明技術方案的內容,依據本發明的技術實質對以上實施例所作的任何簡單修改、等同變化與修飾,均仍屬於本發明技術方案的範圍內。The above is only an embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field of the art, Within the scope of not departing from the technical solution of the present invention, when the technical contents disclosed above can be used to make some modifications or modifications to equivalent embodiments of equivalent changes, but any content that does not depart from the technical solution of the present invention, based on the technical essence of the present invention Any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the technical solution of the present invention.
10‧‧‧手指20‧‧‧指紋感測器21‧‧‧處理單元22‧‧‧儲存媒體30‧‧‧指紋圖像40‧‧‧顯示器50‧‧‧文字51、52、53、54‧‧‧螺旋狀曲線511‧‧‧第一線段512‧‧‧第二線段513‧‧‧第三線段514‧‧‧第四線段515‧‧‧第五線段516‧‧‧第六線段520、530、540‧‧‧指示524、534、566‧‧‧方向記號60‧‧‧指紋圖像70‧‧‧指紋圖像71、72‧‧‧變形指紋圖像10‧‧‧
圖1A為本發明之流程圖的一實施例。 圖1B的流程圖說明本發明如何判斷指紋圖像是否合格。 圖2為本發明實施時使用者依指示之動作圖。 圖3為本發明實施時所獲得的指紋圖像示意圖。 圖4為本發明之指示的第一實施例示意圖。 圖5為本發明之指示的第二實施例示意圖。 圖6為本發明之指示的第三實施例示意圖。 圖7為本發明之指示的第四實施例示意圖。 圖8為本發明之指示的第五實施例示意圖。 圖9A至9C為本發明之顯示指示過程的第一實施例示意圖。 圖10A至10C為本發明之顯示指示過程的第二實施例示意圖。 圖11為本發明拼接為完整指紋圖像示意圖。 圖12為本發明之電子裝置的方塊示意圖。 圖13為現有技術之按壓方法所獲得之指紋圖像示意圖。 圖14為現有技術之掃滑方法所獲得之指紋圖像示意圖。 圖15為現有技術之掃滑方法產生指紋圖像變形示意圖。FIG. 1A is an embodiment of a flowchart of the present invention. The flowchart of FIG. 1B illustrates how the present invention judges whether the fingerprint image is qualified. FIG. 2 is a diagram of a user’s actions according to instructions when the present invention is implemented. 3 is a schematic diagram of a fingerprint image obtained during the implementation of the present invention. 4 is a schematic diagram of the first embodiment of the indication of the present invention. 5 is a schematic diagram of a second embodiment of the indication of the present invention. 6 is a schematic diagram of a third embodiment of the indication of the present invention. 7 is a schematic diagram of a fourth embodiment of the indication of the present invention. 8 is a schematic diagram of a fifth embodiment of the indication of the present invention. 9A to 9C are schematic diagrams of the first embodiment of the display indication process of the present invention. 10A to 10C are schematic diagrams of the second embodiment of the display indication process of the present invention. FIG. 11 is a schematic diagram of a complete fingerprint image stitched by the present invention. 12 is a block diagram of an electronic device of the present invention. 13 is a schematic diagram of a fingerprint image obtained by a prior art pressing method. FIG. 14 is a schematic diagram of a fingerprint image obtained by a conventional sliding method. FIG. 15 is a schematic diagram of fingerprint image distortion generated by a sweeping method in the prior art.
Claims (24)
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CN201811281832.XA CN110516520A (en) | 2018-05-22 | 2018-10-30 | Fingerprint register method and its electronic device |
CN201811435522.9A CN110516521B (en) | 2018-05-22 | 2018-11-28 | Fingerprint registration method and electronic device thereof |
US16/248,747 US20190362127A1 (en) | 2018-05-22 | 2019-01-15 | Fingerprint enrollment method and electronic device using the same |
US16/407,110 US11048954B2 (en) | 2018-05-22 | 2019-05-08 | Fingerprint enrollment method and electronic device using the fingerprint enrollment method |
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US7505613B2 (en) * | 2005-07-12 | 2009-03-17 | Atrua Technologies, Inc. | System for and method of securing fingerprint biometric systems against fake-finger spoofing |
US9390311B2 (en) * | 2014-10-16 | 2016-07-12 | NanoGate Biometric Inc. | Fingerprint identification method |
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